Hello, my name is Ricardo. I'm a big fan of Andy Latimer (Camel guitarist, this is my website about Andy Latimer www.latimerish.com)
I am looking to buy a Burny Les Paul (teasumboosrt or similar) guitar as using Andy, preferably FLG-240 FLG-150 FLG-90 1980 to 1981. Or one RLG-150 RLG-120 from 1982 to 1989.

FYI the 1980/81 FLGs were only produced from mid 1980 to mid 1981 and the FLG-150 & 240 you are talking about are extremely rare. In the years I have been active I have seen only 2 240s and 2 150s.
Also the RLG-120 & 150 were only produced from late 1981 to early 1985, also quite rare. Never seen one outside of Japan.
If you really want one, I would monitor Yahoo Japan if I were you. But the problem is, you need to be an expert to identify one. (except for some 120s or 150s that have been cavity stamped or written with a marker).

As you seem new to Burny, you should know that Burny is a brand name of Fernandes. Fernandes did and still does not have their own factory but had/have their guitars made under OEM. The time period for Burny producing factories is roughly like this:

Not a 120. A 1990 Dyna made RLG-90 or custom order because I have never seen a solid topped RLG-90 from that period. But it has a 2 piece back, so nothing really fancy.
RLG-120s were stopped being produced from early 1985.